Exclude String from RegexpHostMatcher

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How can I exclude a certain character string from a match?
I am using the RegexpHostMatcher for redirecting virtual hosts to their 
own directories. No problem so far.

Now, in order to keep Cocoon's samples and docs in $Cocoon-Home, I want 
to exclude "cocoon" from this match.

I searched for a suitable expression [1] and tried the following
================================
<map:match pattern="(.*(?!cocoon)):(.*)" type="regexphost">
  <map:mount check-reload="yes" src="/srv/www/{1}/" uri-prefix=""/>
</map:match>
================================
But I am only getting this error message:
  org.apache.avalon.framework.component.ComponentException:
  Invalid pattern '(.*(?!cocoon)):(.*)' for matcher at line ...
That's what I don't understand. How can I fix it?
Thanks for your attention
[1] <http://www.zvon.org/other/PerlTutorial/Output/example23.html>
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